build(deps): update checkers requirement in /bindings/rust/extended

Updates the requirements on [checkers](https://github.com/udoprog/checkers) to permit the latest version.
- [Commits](udoprog/checkers@0.6.0...0.7.0)

---
updated-dependencies:
- dependency-name: checkers
  dependency-version: 0.7.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

bindings/rust/extended/s2n-tls/Cargo.toml

@@ -35,4 +35,4 @@ openssl = "0.10"
 openssl-sys = "0.9"
 foreign-types = "0.3" # newer versions require updated ForeignTypeRef, see https://github.com/sfackler/rust-openssl/issues/2298
 temp-env = "0.3"
-checkers = "0.6"
+checkers = "0.7"